What are the Qualities needed by a software tester?

What are the Qualities needed by a software tester?
 He/she must observe the problem from both the side say User and programmer.
 Must have well under standing with other team members.
 Able to understand programmers view.
 Once start testing, do not put it remain.
 First test requirements of the user.
 Before start testing first analysis the project like;
 Technology using in project, all the flow etc??

A GOOD tester has the following qualities
 Test to break attitude
 His view as Customer.
 Should be tactful & diplomatic.
 Strong desire for quality.
 Excellent communication skills.
 Should have some development experience